<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>mingtai</title>
</head>
<body>
    <h1>11</h1>
    <h2>2222</h2>
    <script>

        function foo(s){
            return s
        }
        console.log(foo(6))
    </script>
</body>
</html>